Cognomen 岩永 (Iwanaga 
, 岩永 ) , in the world, is quite a rare surname. The cognomen 岩永 is characteristic of Japan, where it is a rare surname, Singapore, and Brazil. Measured by absolute frequency, the name is most common in Brazil, Japan, and the United States. Likewise, 岩永 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Iwanaga | Peru, Brazil, United States, Japan, China |
| 岩永 | China |
| 岩永功 Japanese baseball player, JP (b. 1941) |
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岩永千明 JP (b. 1982) |
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| 岩永哲哉 Japanese voice actor, JP (b. 1970) |
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| 岩永雅子 Japanese singer, JP (b. 1973) |
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| 岩永 徹也 Japanese pharmacist and model, JP (b. 1986) |
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| 岩永雄太 Japanese association football player, JP (b. 1986) |
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